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[82.69.66.36]) by smtp.gmail.com with ESMTPSA id ffacd0b85a97d-498367ba82csm16541261f8f.50.2026.11.12.04.02.50 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 12 Nov 2026 04:02:51 -0800 (PST) Date: Thu, 12 Nov 2026 12:02:48 +0000 From: David Laight To: Yunhui Cui Cc: pjw@kernel.org, palmer@dabbelt.com, aou@eecs.berkeley.edu, alex@ghiti.fr, dennis@kernel.org, tj@kernel.org, cl@gentwo.org, oleg@redhat.com, ast@kernel.org, daniel@iogearbox.net, andrii@kernel.org, eddyz87@gmail.com, memxor@gmail.com, martin.lau@linux.dev, song@kernel.org, yonghong.song@linux.dev, jolsa@kernel.org, emil@etsalapatis.com, ihor.solodrai@linux.dev, bjorn@kernel.org, pulehui@huawei.com, puranjay@kernel.org, broonie@kernel.org, dave@stgolabs.net, jszhang@kernel.org, tglx@kernel.org, conor.dooley@microchip.com, thuth@redhat.com, ajones@ventanamicro.com, ben.dooks@codethink.co.uk, rkrcmar@ventanamicro.com, samuel.holland@sifive.com, zong.li@sifive.com, debug@rivosinc.com, seanwascoding@gmail.com, andybnac@gmail.com, menglong8.dong@gmail.com, cyrilbur@tenstorrent.com, wangruikang@iscas.ac.cn, atishp@rivosinc.com, apatel@ventanamicro.com, arnd@arndb.de, nathan@kernel.org, nick.desaulniers+lkml@gmail.com, morbo@google.com, justinstitt@google.com, qingfang.deng@siflower.com.cn, linux-riscv@lists.infradead.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org, bpf@vger.kernel.org, linux-arch@vger.kernel.org, llvm@lists.linux.dev Subject: Re: [PATCH v10 2/9] riscv: add infrastructure for preemptible this_cpu operations Message-ID: <20261112120248.5c8265e2@pumpkin> In-Reply-To: <20261112104149.38589-3-cuiyunhui@bytedance.com> References: <20261112104149.38589-1-cuiyunhui@bytedance.com> <20261112104149.38589-3-cuiyunhui@bytedance.com> X-Mailer: Claws Mail 4.1.1 (GTK 3.24.38; arm-unknown-linux-gnueabihf) X-Archived-By: MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit X-Rspamd-Server: rspam04 X-Rspamd-Queue-Id: 15F49180004 X-Spam-Status: No, score=-4.3 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,FREEMAIL_FORGED_FROMDOMAIN,FREEMAIL_FROM, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_PASS, SPF_PASS,USER_AGENT_SANE_2 autolearn=no autolearn_force=no version=4.0.1 X-Stat-Signature: o51cumd34eg85ujia8d31bb9rpfhdns9 X-Rspam-User: X-HE-Tag: 1794484973-894419 X-HE-Meta: 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 T0TnmHM1 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 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: X-Spam-Checker-Version: SpamAssassin 4.0.1 (2024-03-26) on aws-us-west-2-korg-listserv-alma10-1 On Thu, 12 Nov 2026 18:41:42 +0800 Yunhui Cui wrote: > +/* > + * Mark a region where the per-CPU offset and address registers may need to > + * be rewritten by exception return after migration. The three registers > + * must remain distinct for the whole region. > + */ > +#define __PCPU_GPRS_BEGIN \ > + __DEFINE_ASM_GPR_NUMS \ > + __PCPU_GPRS_ASSERT_DISTINCT \ > + "li %[off], " __PCPU_GPRS_VALUE "\n" \ > + "sh %[off], %[gprs]\n" \ > + REG_L " %[off], %[pcpu_offset]\n" \ > + "add %[addr], %[pcp], %[off]\n" > + > +#define __PCPU_GPRS_END \ > + "sh zero, %[gprs]\n" Those are quite nasty with all the hidden variable names. It wouldn't do any harm to pass the names though. 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[82.69.66.36]) by smtp.gmail.com with ESMTPSA id ffacd0b85a97d-498367ba82csm16541261f8f.50.2026.11.12.04.02.50 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 12 Nov 2026 04:02:51 -0800 (PST) Date: Thu, 12 Nov 2026 12:02:48 +0000 From: David Laight To: Yunhui Cui Cc: pjw@kernel.org, palmer@dabbelt.com, aou@eecs.berkeley.edu, alex@ghiti.fr, dennis@kernel.org, tj@kernel.org, cl@gentwo.org, oleg@redhat.com, ast@kernel.org, daniel@iogearbox.net, andrii@kernel.org, eddyz87@gmail.com, memxor@gmail.com, martin.lau@linux.dev, song@kernel.org, yonghong.song@linux.dev, jolsa@kernel.org, emil@etsalapatis.com, ihor.solodrai@linux.dev, bjorn@kernel.org, pulehui@huawei.com, puranjay@kernel.org, broonie@kernel.org, dave@stgolabs.net, jszhang@kernel.org, tglx@kernel.org, conor.dooley@microchip.com, thuth@redhat.com, ajones@ventanamicro.com, ben.dooks@codethink.co.uk, rkrcmar@ventanamicro.com, samuel.holland@sifive.com, zong.li@sifive.com, debug@rivosinc.com, seanwascoding@gmail.com, andybnac@gmail.com, menglong8.dong@gmail.com, cyrilbur@tenstorrent.com, wangruikang@iscas.ac.cn, atishp@rivosinc.com, apatel@ventanamicro.com, arnd@arndb.de, nathan@kernel.org, nick.desaulniers+lkml@gmail.com, morbo@google.com, justinstitt@google.com, qingfang.deng@siflower.com.cn, linux-riscv@lists.infradead.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org, bpf@vger.kernel.org, linux-arch@vger.kernel.org, llvm@lists.linux.dev Subject: Re: [PATCH v10 2/9] riscv: add infrastructure for preemptible this_cpu operations Message-ID: <20261112120248.5c8265e2@pumpkin> In-Reply-To: <20261112104149.38589-3-cuiyunhui@bytedance.com> References: <20261112104149.38589-1-cuiyunhui@bytedance.com> <20261112104149.38589-3-cuiyunhui@bytedance.com> X-Mailer: Claws Mail 4.1.1 (GTK 3.24.38; arm-unknown-linux-gnueabihf) X-Archived-By: MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.9.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20261112_040255_494010_366181C3 X-CRM114-Status: UNSURE ( 7.46 ) X-CRM114-Notice: Please train this message. X-Spam-Score: -2.1 (--) X-BeenThere: linux-riscv@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-riscv" X-Spam-Status: No, score=-2.3 required=3.0 tests=BAYES_00,DKIM_ADSP_CUSTOM_MED, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_EF,FREEMAIL_FORGED_FROMDOMAIN, FREEMAIL_FROM,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI, SPF_HELO_NONE,SPF_PASS,USER_AGENT_SANE_2 autolearn=no autolearn_force=no version=4.0.1 X-Spam-Checker-Version: SpamAssassin 4.0.1 (2024-03-26) on aws-us-west-2-korg-listserv-alma10-1 On Thu, 12 Nov 2026 18:41:42 +0800 Yunhui Cui wrote: > +/* > + * Mark a region where the per-CPU offset and address registers may need to > + * be rewritten by exception return after migration. The three registers > + * must remain distinct for the whole region. > + */ > +#define __PCPU_GPRS_BEGIN \ > + __DEFINE_ASM_GPR_NUMS \ > + __PCPU_GPRS_ASSERT_DISTINCT \ > + "li %[off], " __PCPU_GPRS_VALUE "\n" \ > + "sh %[off], %[gprs]\n" \ > + REG_L " %[off], %[pcpu_offset]\n" \ > + "add %[addr], %[pcp], %[off]\n" > + > +#define __PCPU_GPRS_END \ > + "sh zero, %[gprs]\n" Those are quite nasty with all the hidden variable names. It wouldn't do any harm to pass the names though. David _______________________________________________ linux-riscv mailing list linux-riscv@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-riscv